197407840 has 96 divisors (see below), whose sum is σ = 545529600. Its totient is φ = 66092544.

The previous prime is 197407811. The next prime is 197407867. The reversal of 197407840 is 48704791.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 197407793 and 197407802.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46111 + ... + 50209.

It is an arithmetic number, because the mean of its divisors is an integer number (5682600).

Almost surely, 2^197407840 is an apocalyptic number.

197407840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 197407840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (272764800).

197407840 is an abundant number, since it is smaller than the sum of its proper divisors (348121760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

197407840 is a wasteful number, since it uses less digits than its factorization.

197407840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4164 (or 4156 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 197407840 is about 14050.1900343020. The cubic root of 197407840 is about 582.2660459042.

The spelling of 197407840 in words is "one hundred ninety-seven million, four hundred seven thousand, eight hundred forty".